| 摘要 |
PROBLEM TO BE SOLVED: To always maintain an optimum radiating effect and to make a driving state visible at a low cost and with ease by providing a reflection means reflecting reading laser beam to an optical component and a reflection means driving means. SOLUTION: A head part 40 builds-in a metallic base 51 supporting only laser diode(LD) and a light source 20 and a platelike printed circuit board 1 integrally fixed with this metallic base 51, and an optical component excepting for the light source 20, namely a reading optical system, is supported on this printed circuit board 1. Then a photodetector 25 is arranged at a position within the optical path range of a reflected light reflected from an optical patter 44a and not-interrupting the reflected light and receives a reflected light converged by a projecting spherical surface mirror part 15b to convert to a prescribed electrical signal. In addition a mirror driving device 3 rotates a mirror 15 by a prescribed angle so as to scan the reading laser beam reflected from a flat surface mirror part 15a along the optical pattern 44a. |
